Costume of the main character

I want the main character to be very average looking, so the audience can almost relate to him, he'll be in very real locations so it would look strange if he was dressed in a way that's out of the ordinary.
Inspiration:

Actual costume was just a simple pair of dark jeans and a blue coat, these are the only parts of clothing you see on the character as there is not a lot of close up work etc.